Use the email you used to sign up. You will be emailed a link to log you in. Be sure to check your spam folder!
Don't have a login, and coming to MWDC? Register!
FAQ You don't need a password. This sends a "magic" link to your email, usable only by you. You'll stay logged in for 14 days after that; just come back and you're logged in! You will need to log in from each device you use, though (once for phone, once for laptop, and so on).